added contributions

team/contributions/contrib_chriswoolson.md

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+My main contribution towards the project has been the database. At first the database was a Firebase Realtime Database. I created the database, structure and functions to use towards the frontend for this. Later, we descided to switch to Firebase Firestore. I set this database up as well as well as making most of the service file functions.
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+These aspects may be underrepresented in the github commits.
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+I also worked fixing bugs:
+- Blank Screen
+- Duplicate Key error
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+I added a loading animation for the home screen
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+I created the frontend (and backend) for adding friends through the search page.
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+I added a refresh function for the home and workout page by swiping down on the list.